Blasting-plug.



I. SWINGLE.

BLASTING PLUG.`

APPLICATION FILED AUG.z3, 1910.

Patented May 3o, 1911.

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Sme/who@ srarns BLAsrI'Ne-PLUG.

4Specification of Letters Patent.

Appia-ation mea August as, 1910. serial 110.578,573.

To all whom it may concern! Be it known that I, IRA SWINGLE, a citizen of the United States, residing at Wendel, in the county of lVestmoreland and State of Pennsylvania, have inventedcertain new and useful Improvements in Blasting-Plugs,

of which the following is a specification.

This invention relatesto blasting plugs,

. and is designed particularly as an improvement on Patent #921144 granted to C. P. McGregor May 11, 1909.

This invention is applicableA to all classes of mining but particularly to coal mining and is designed to prevent the back shots which often occur in coal mines exploding the gases causing a great deal of damage.

Vith the above and other objects in view, this invention consists in the construction, combination, and arrangement of parts, all as hereinafter more fully described, claimed, and illustrated in the accompanying drawings, wherein- Figure l is a central, longitudinal section of. the explosion plug forming the subject matter of the present invention; Fig. 2 is an outside elevation of one of the gripping dogs; Fig. 3 is a transverse section taken along line 3 3 of Fig. 4; Fig. 4 is a central, longitudinal section of a modification of the present invention.

Reference being had more particularly t0 the drawings, l0 indicates the collar having an opening 11 extending'therethrough, the rear portion 12a of said opening being reduced and the forward extremity thereof being provided with interior threads.' A copper point 12 having the threadedshank 13 thereon Vis adapted to be secured in the threaded portion of the opening 11 of the collar 10.` The operating rod 14 is swiveled in the opening 11 adjacent to the reduced portion 12 thereof through the linstrumentality of the circular shoulder formed at the inner terminal thereof. This rod is provided with a series of threads 16 which -extend approximately throu hout its entire length and the faced head1?. A groove 18 is provided in one side of the rod 14 and extends throughout the entire len A h thereof, said groove coperating with t e passage 21 in the point 12 and forms a 'housing for the Wire 22 which extends'over the battery indicated as A to the. cap indicated as B. The

circuit is completed by a wire 23 extending to the rod which is in circuit with the point 12 throughout the instrumentalty of the wire 24 extending from said point to said cap.

A pair of diametrically disposed recesses 25 are formed in the outer extremity of the collar 10 in which are pivoted the dogs 26. These dogs are semicircular in formation and are provided with the lugs 27 at their inner terminals which are pivoted in the recesses 25 by the pins 28. Each dog 26 has a series of outwardly extending teeth 29 which extend transversely over the surface of the dog and which conform with the contour thereof. The dogs 26 are pierced by the passages 3Q which form guides for the expanding nut as hereinafter more fully described.

A tapered expanding nut 31 operates on the threads 16 of the rod 14-and is provided Patented 3(4)., 1911. i

with a pair of diametrical 'projections 32' i which coperate with the passages 30 in the dogs for the-purpose of guiding the same.

From this construction it will readily be seen that by rotating the rod 17 about the swivel formed by the shoulder, the expand-` ing nut will be forced inwardly causing the I dogs to operate outwardly'from'the rod 14 about the pins 28 as pivots causing said dogs to bite into the wall of the opening and firmly secure the blasting plugs.

`Referring to the modification illustrated in Fig. 4, 10 indicates a collar constructed similarly to the collar 10 having the dogs 26 pivoted thereto, said dogs coperating with the expanding nut 31 similar in construction to the expanding nut 3l. A copper point 12 is shrunk into the. collar 10 and, forms in combination withthe collar 10 a socket for the ball 33 which carries a rod 34. A threaded l,rod 14 is connected to the rod 34 by the joint 35 and similar tothe construction of the rod- 14, the expanding nut 31 being'held in position by the jam nut 36. In order to close the opening in which the blasting plug is placed and' make the same air tight, a collar 37 is' slidably mounted upon the outer termina-l of thel rod 14 and is held in position on said rod against the outer terminal of said opening by the jam nut 38. A blasting barrel 39 is mounted between the dogs 26 and is threadwd or otherwise secured to the copper point the copperpoint being pierced by the openp I ings 40 through which the products of combustion pass to the blasting barrel.

Having thus fully described my invention, what. is claimed as new isz- 1. A' blasting device, comprising a point having a reducedportion at its outer extremity, a 4collar detachably carried by said point, a rod swiveled between said point and said collar, dogs pivoted to said collar, and an eX- pansion member operating on said rod and engaging said dogs for expanding the same.

2. A blasting devicefcomprising a point, a collar detachably carried thereby having an opening therein, a'rod swiveled in said openlng, semicircular toothed dogs pivoted to said collar, each dog having a longitudinal passage therein, an expansion nut operating on said rod having diametrically disposed plugs adapted to operate'in the passages of said dogs, and means whereby an electric current may be conducted from said device to the other.

v3. A blasting device, comprising a point, a collar detachably carriedfthereby having an opening therein, a rod swiveled insaid opening, semicircular toothed dogs pivoted to said collar, each dog having a longitudinal passage therein, an expansion nut operating on said rod vand having diametrically disposed lugs adapted to operate in'the passages of said dogs, and means wherebyv the opening vin which said device is placed may be made air tight.

In testimony whereof I aiiix my signature in presence of two witnesses.

mA swINGLE. i

one end of Witnesses:

Trios. I. CALLAHAN, JACOB L. MYERs. 

